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Detailed computation of hot-plasma atomic spectra

Jean-Christophe Pain 1 Franck Gilleron 1 Thomas Blenski 2, 3
3 MHDE - Matière à Haute Densité d'Energie
IRAMIS - Institut Rayonnement Matière de Saclay, LIDyl - Laboratoire Interactions, Dynamiques et Lasers (ex SPAM)
Abstract : We present recent evolutions of the detailed opacity code SCO-RCG which combines statistical modelings of levels and lines with fine-structure calculations. The code now includes the Partially Resolved Transition Array model, which allows one to replace a complex transition array by a small-scale detailed calculation preserving energy and variance of the genuine transition array and yielding improved higher-order moments. An approximate method for studying the impact of strong magnetic field on opacity and emissivity was also recently implemented. The Zeeman line profile is modeled by fourth-order Gram-Charlier expansion series, which is a Gaussian multiplied by a linear combination of Hermite polynomials. Electron collisional line broadening is often modeled by a Lorentzian function and one has to calculate the convolution of a Lorentzian with Gram-Charlier distribution for a huge number of spectral lines. Since the numerical cost of the direct convolution would be prohibitive, we propose, to obtain the resulting profile, a fast and precise algorithm, relying on a representation of the Gaussian by cubic splines.
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Submitted on : Friday, June 24, 2016 - 3:53:22 PM
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Jean-Christophe Pain, Franck Gilleron, Thomas Blenski. Detailed computation of hot-plasma atomic spectra. Laser and Particle Beams, Cambridge University Press (CUP), 2015, 33 (2), pp 201-210. ⟨10.1017/S0263034615000257⟩. ⟨cea-01337181⟩



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